Grinding-machine.



H. NORDVALL.

GRINDING MACHINE.

APPLIUATION FILED MAR. 24, 1913.

Patented Mar. 2, 1915.

IHE NORRIS PETERS C0. PHOTC-LATHQ, WASHINGTON D. C

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i Gn ivnIne-i/mcnmn v T aZlZ. whom it may concern Be it known that :I,:I-IJALMAR NORDVALL, a subject of the King ofSWeden', and aresident ofChicago; Cook county; Illinois, have I which needs tobe: held in avise',and provided with a tilting table which'may be temporarily mountedon-the viseyasqin the case ofzthe grindingwhe'el', to holdother kinds ofwork in proper relation ztoathe grindingwheel. -Foot-fpower air-pressureis utilized as the driving'force and the exhaust air is directed toclear the Work. of dust. 2'? y In the accompanying drawing-Figure 1 is aside elevation, partly in section, of a machine embodying my invention.Fig. 2 is a plan View of the machine. Fig. 3 is a perspective view on asmall scale of the machine equipped with driving means. Fig. 4 is asection taken substantially on line 4- 1 of Fig. 1. Fig. 5 is asectional elevation of the motor, taken substantially on line 55 of Fig.2. Fig. 6 is a section taken substantially on lineG-G of Fig. 2.

In the several views 2 represents a conventional vise secured by a clamp3 to a bench 4 and provided with an anvil portion 5 and jaws 6 and 7 thelatter being movable on a pivot 8. On the jaw 7 is a lug 9 which has athreaded horizontal bore that is engaged by a screw 10 turned by meansof a hand-wheel 11. The ends of the screw are journaled in bearings 12at the ends of a work-table 13, near its upper edge. Near its lower edgethe table 13 is supported by a curved leg 14 which is slidably mountedon a rod 15 having its ends securedto brackets 16 near the ends andlower edge of the table, said leg being mounted at one end for slidingmovement in a slot 17 in the body of the vise. The leg is normally heldagainst sliding movement in this slot by a bolt 18 with a Winged head19, this bolt engaging a threaded bore in the vise and its inner endbearing against the leg S pecification of Letters Patent. Applicationfiled Ma1c1124, 191s. Seria1l\To. 756,296.

lPatented Man-2, 1915..

14. Immediately back of the jaw 6 the body, of the'vise has thereon aT-shapedlug 'or support 20'which engages a correspondingly formed slot21 in thelower end f a standard 22awhich is hollow'and is telescoped ;bya vertically adjustable support 23: on theupper end of which isfulcrumed on abolt 2 1 a lever 95. Thebolt 24= engages a slot 26 in. thelever wherebythe 1l.atltter 1S longitudinally adjustable on the of .Thehandle-end 27 of the lever is heldnormally raised'by .as spring 28.having its upper end-secured .at129 tothe rear end of the lever and itslower end secured to a lug 30 on the standard22. The'latter is removablysecured to the lug 20.by means of a set screw .fora rotary shaft havingkeyed to one end thereof an air-motor 36. On the opposite end of thisshaft is a ball-joint ball 37 to which is fitted a hub for a grindingwheel consisting of a pair of clamp-members 38 and 39 secured togetherby screws 40 and 41 passing through bores in the member 38 and havingthreaded engagement with the member 39, as shown in Fig. 6. In theperiphery,

of the hub is a groove 42 in which is secured an annular grinding wheel43. The hub and its wheel 43 are angularly adjustable relative to theshaft 35 on the ball-joint for which purpose the latter has therein aslot 424: loosely engaged by the inner end of a screw 45 that hasthreaded engagement with the member 38 of the hub. The angularadjustment is eii'ected by a fork having forkmembers 16 and 47 thatengage opposite sides of the hub as in Fig. 4:. This fork is providedwith a shank 18 that is engaged with a horizontal slot 49 in a standard50 that rises from the bearing 34. The shank 4:8 is movablelongitudinally in the slot 49 whereby the wheel 43 is tilted to accommodate it to various angles of surface that the grinding wheel is causedto operate upon. The shank is held in any position into which it hasbeen adjusted by a set screw 51 having its clamps.

' j aws, together with the. adjustability of the threaded engagementwith a bore in the standard and bearing against the shank. The inlet tothe air-motor which is on the same shaft asthe grinding wheel, is at 53and the outlet is at 52. The inlet is connectedby means ofa-flexibletube 5% with an air-pressure tank 55 (Fig. 3) into which air is pumpedby a compressor or engine 56 which may bedriven by a treadle 57 pivotedat 58 to a stationary part of the engine and pivoted at-59 to a crankconnection with a wheel 60, the details of which are innnaterial, as anyother'mechanism for the purpose adapted to accomplish it willserve justa-s'well for the purpose of the present invention, The outlet, orexhaust, of the air-engine 36 is provided with a nozzle 61 which isarranged to direct the outflowing exhaust air against the work and thegrinding wheel.

"62 represents a saw on the tilting table arranged to have its teethground or sharp- V ened by the tapered type of grinding wheel shown. 7 I

63 and 64 are clamps for holding the work when this is of such a naturethat it requires the supportof the'table 13 with or without The openingbetween the vise grindingwheel and its engine, is adapted to take theplace of the table as work-holding means where a vise-hold is needed. Atthe exhaust or air-outlet for the engine 36 is arranged a valve 65:controlledxby a finger le- Copies 6: this patent may be obtained for ver66 connected with the valve 65 by a rod 67. By means of this lever andvalve the operator may stop and start the engine by stopping andstarting the flow therethrough of the air. s

It will be noticed that the grinding machine attachments are quicklyremovable from the vise when it is desired to use the latter exclusivelyas a vise and not as a mere support and work-holder for the grinder.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. The combination with an angularly and longitudinallyadjustable hand-lever, of a grinding wheel and the like rotary elementoperative upon a piece of work, means for rotating same, and means onsaid lever for controlling the motive power.

2. The combination with a hand-lever, of means for adjusting said leververtically and horizontally with respect to its axis of angularmovement, a source of power, a driving motor on said lever, and means onsaid lever for controlling said motor.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

HJALMAR NORDVALL.

Witnesses EDWIN B. NnLsoN, J. W. BECKSTROM.

five cents each, by addressing the Commissioner of Patents, Washington,D. C.

